More robust determination of rtype location / fix issue 302 #304
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Resolves #302.
This increases the robustness of the handling of the docutils tree. The docutils rst parser seems to have a bunch of bugs / shortcomings. The original problem was that several list types do not get their line number set. So to find the line number of a node, if the node itself has None as the line number, we descend through the first children of the node until we find one with a non-None line number.